Columbine High School, site of one of the most grisly school massacres in U.S. history, is the school Carpenter referenced in a written manifesto which detailed her plot to shoot up Danbury and Stratford high schools, to get back at students who she believed bullied her.

The phoned-in threat to Columbine, made in the early morning hours of Sept. 16, originated from a cell phone traced back to 130 Overland Dr., in Stratford, where Carpenter lived with her mother and sister, according to 69 pages of Stratford police reports released this week to The Register Citizen through a public records request.

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The threat was serious enough that school officials contacted the Jefferson County Sheriff’s office to report it, sheriff’s spokesman Mark Techmeyer said, but he couldn’t say if the school was actually locked down as a precaution.

Joseph Maguire, with the Jefferson County Sheriff’s office, was the lead investigator assigned to the case, which was closed without charges being filed as authorities decided against indicting Carpenter on a single misdemeanor count of making false threats because of the cost for extradition, Techmeyer said.

He cited it as just one of nearly two dozen threats the department investigates every year at Columbine High School.

“You look at the risk-value return,” Techmeyer said. “She’d have to transported. It’s not a wise use of taxpayer dollars.”

Most threats are made from out of state, and in some cases, out of the country.

The number of threats “would blow your mind,” Techmeyer said. “It’s nonstop. It’s not every day, but it’s a very regular occurrence. We investigate every single one of them, but 99.9 percent of the time, just about every time, they’re not credible threats.”

Maguire, who referred all questions to Techmeyer when reached by phone Saturday afternoon, asked Stratford police last September to assist with the investigation when a Stratford-based caller, later identified as Carpenter, said they planned to shoot up a school in Colorado.

Officer Matthew Corbit of Stratford police wrote in his report he went to the family’s home and spoke with Carpenter’s mother, Wendy, who suspected Carpenter was behind the call, telling police her daughter had a history of mental illness and was acting strangely after switching medications.

Carpenter allegedly admitted threatening to kill people and blamed it on her change in medication.

Chilling entries in a manifesto were found in Carpenter’s diary at her Main Street apartment at Hope House, a psychiatric facility. In them, Carpenter referred to Columbine gunmen Eric Harris and Dylan Klebold as “heroes” and said she wanted to “follow in their footsteps.”

The former student of Stratford High School and Frank Scott Bunnell High School also alluded to past instances of bullying and inquired about purchasing a 12-gauge tactical shotgun from a gun store in Torrington.

The revelations, along with reports of more than three dozen run-ins Carpenter had with Stratford police, bring up questions about whether more could have been, legally or medically, to correct Carpenter’s behavior before she spiraled out of control.

In one report, an officer in the department writes of Carpenter, who is known to suffer from personality disorders, ADHD, depression and has cut herself and attempted suicide.

“Natalie is known to this department and is known to have psychological problems,” the report states.

In one of the more serious episodes, Stratford police decided against filing charges against Carpenter after fire officials ruled arson was the cause of a fire that broke out in the backyard of her home on the evening of Sept. 4, 2010, when Carpenter’s mother left to go return movies to a local Redbox.

Several calls to the police department’s public information officer were not immediately returned.

The police report says Stratford detectives worked with the town’s fire marshal. Brian Lampart, and interviewed several witnesses, including some of Carpenter’s family members, about the incident which sent Carpenter to the hospital with second-degree burns on her legs. First-responders arrived to the sounds of Carpenter “screaming bloody murder,” according to one witness.

Authorities said Carpenter, who described herself as “naturally curious” in a post-fire interview with police, intentionally doused a lawn chair and parts of the grass with gasoline before starting them ablaze with a butane lighter.

A charred one-gallon gas container was found in the backyard, and Carpenter’s flip-flops had burn marks, from when she went to stamp out the fire, according to the police report.

Carpenter initially denied starting the fire, but eventually admitted to it after authorities pointed out inconsistencies in her story and questioned her about a melted fire alarm they found in the house.

Authorities also noted in their report the family’s initial lack of cooperation, saying they believed Carpenter’s grandmother, Joan, coached her sister, Renee, about how to answer questions. Detectives said Renee Carpenter often looked over at her grandmother for “direction.”

Authorities decided the “best option” was “increased treatment of Natalie.”

Some incidents contained in the investigative documents refer to run-ins The Register Citizen already reported, like when Carpenter rammed her mother’s SUV into a neighbor’s garage door in November 2010. Apprised of the incident, Wendy Carpenter told police she was trying to get help for her “out of control daughter.”

That was part of more rampant harassment 22-year-old Nick Forrest said his family experienced over several years. At one point, the family considered installing surveillance at their home to deter Carpenter.

The 69 pages of documents were only a part of Carpenter’s file released to The Register Citizen. The town’s attorney cited exceptions in denying a request to release an additional 70 pages of investigative documents.

Still, Stratford police said Carpenter’s named showed up 48 times in its database, after she was arrested on charges of vandalism and trespassing, among other things.

In June 2013, Stratford police arrested Carpenter after she left several handwritten notes on neighbors’ doors, threatening to smear feces on their vehicles.

Carpenter admitted leaving the notes as part of a “prank” after she saw a YouTube video about “Note Bandits,” according to a police report.

One neighbor told police she thought she was getting “robbed,” until she discovered the note, which said, “Hey guys I don’t really think it’s funny that your son Andrew Te-Pe’d my house. I would understand if he only did it once but 9 times? That’s a bit extreme, so to teach you guys a lesson I returned all the toilet paper somewhere in your yard you will need it to clean up the dog [expletive deleted] I smeared all over your house.”

The father of a female student at Bunnell High School, where Carpenter was once a student, told police Carpenter called his daughter more than 20 times in 2009. The school was made aware of the harassment after the school resource officer told officials.

Other police reports include instances of Carpenter ringing neighbors’ doorbell late at night; physical scuffles, including one where Carpenter claimed she was assaulted by an unknown female outside the public library while walking home.

Carpenter also reported receiving several explicit sexual text messages and calls from an unknown number, but an investigation didn’t go forward after the family decided it didn’t want to pursue it.